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Band 14 in the US is reserved for First Responders via First Net aka AT&T, and when the other bands get overloaded then it’s given use to regular consumers - if they have band 14. From my understanding. Because there aren’t many phones that have 14 on them sold outside of AT&T from what I find, unless band 14 access is a software adjustment, but that I don’t know.
I honestly didn’t know there were different variations of Xperia, I bought mine through the Sony Website.